2004 sienna ac drain is plugged. Please advise as to how to locate and clear.

In my case, apparently some rotten auto tech tried to make a couple of bucks at my expense by plugging the drain hose intentionally with a screw. Had a wet carpet for two days before finding the problem.
I found the drain hose by removing the small panel cover at the bottom of the console on the passenger side, below the glove compartment. There is a plastic phillips screw that you need to loose. This is a lock pin that once is loose, you can remove the small panel. The rubber drain hose comes out of the evaporator and into the chassis of the van.